CN101956140A - Lining plate for large ball mill and casting method thereof - Google Patents
Lining plate for large ball mill and casting method thereof Download PDFInfo
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- CN101956140A CN101956140A CN 201010294909 CN201010294909A CN101956140A CN 101956140 A CN101956140 A CN 101956140A CN 201010294909 CN201010294909 CN 201010294909 CN 201010294909 A CN201010294909 A CN 201010294909A CN 101956140 A CN101956140 A CN 101956140A
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Abstract
The invention discloses a lining plate for a large ball mill and a casting method thereof. The lining plate comprises the following chemical components in percentage by weight: 0.40-0.50% of C, 1.8-2.0% of Mn, 0.7-1.0% of Si, 1.8-2.1% of Cr, 0.35-0.65% of Mo, 0.004-0.008% of B, 0.03-0.04% of Nb, 0.02-0.05% of Ce, less than 0.03% of P, less than 0.03% of S and the balance of Fe and inevitable impurities. The lining plate for the large ball mill has the thickness greater than 140 mm and the piece weight more than 1500 kg. The finished lining plate product has excellent wear-resisting property, high hardness, good toughness and high strength; the hardness is not less than HBW515, the impact toughness is not less than 42 J/cm2, and the tensile strength is up to 1610 MPa.
Description
Technical field
The invention belongs to metal founding manufacturing technology field, be specifically related to a kind of large-size ball mill liner plate and castmethod thereof.
Background technology
Ball mill is industries such as metallurgical ore grinding, cement, generating milling equipments commonly used.The main effect of ball grinding machine lining board is that protection grinding machine and drive abrading-ball grind and pulverize material.The main failure forms of ball grinding machine lining board is the abrasive wear under little energy repeatedly impacts, and according to statistics, the iron and steel that China consumes on ball mill every year reaches millions of tons.Therefore the wear resistance that how to improve ball grinding machine lining board is the focus of research always.
Before the last century the eighties, China's lining material adopts high mangaenese steel basically.The subject matter that exists in the high manganese steel lining plate use is work hardening fully, its residual surface hardness only has HBS270～350, in the grinding machine in dressing-works, can not surpass HBS300 yet, not reach the level of the work hardening limit HBW500 of high mangaenese steel far away.So, make ball grinding machine lining board with high mangaenese steel and can not bring into play the work hardening characteristic of high mangaenese steel because of it, so wear no resistance, work-ing life is short.Because the yield strength of high mangaenese steel is low, and viscous deformation in use easily takes place liner plate, make repair demolition very difficult again.Adding the high manganese steel lining plate of some alloying element or alloy white pig iron liner plate is significantly increased than the resistance to abrasion of common high manganese steel lining plate, but cost is increased owing to containing noble metals such as a large amount of Cr, Ni, Mo in these materials, and it is in production and use, also be easy to generate crackle, even broken.Occurred in recent years adopting antifriction cast iron to make the report of ball grinding machine lining board, but because antifriction cast iron fragility is big, liner plate in use is prone to fracture, influences the safe operation of ball mill.Make ball grinding machine lining board with low alloy steel, have the deficiency that intensity and hardness are low, wear no resistance, its wear resistance only slightly improves than high manganese steel lining plate.For obdurability and the wear resistance that improves steel alloy, usually all to add alloying elements such as molybdenum, nickel, chromium, tungsten, vanadium, in short supply day by day along with alloy resource, molybdenum, nickel, chromium, tungsten, vanadium etc. are becoming tight alloy supply day, price rapidly goes up, and causes common iron and steel high-abrasive material production cost constantly soaring.Along with industrial expansion, ball mill also changes from small to big, from the seventies and eighties based on 2～3 meters of diameters, develop into the nineties and be very popular for about 4 meters, until now to 5～9 meters development, some lining materials originally can not meet the demands.
Summary of the invention
The purpose of this invention is to provide the large-size ball mill liner plate that a kind of wear resisting property is good, production cost is low.
Simultaneously, the present invention also aims to provide the castmethod of a kind of large-size ball mill with liner plate.
In order to realize above purpose, the technical solution adopted in the present invention is: a kind of large-size ball mill liner plate, the weight percentage of its chemical constitution and each moiety is: C:0.40～0.50%, Mn:1.8～2.0%, Si:0.7～1.0%, Cr:1.8～2.1%, Mo:0.35～0.65%, B:0.004～0.008%, Nb:0.03～0.04%, Ce:0.02～0.05%, P＜0.03%, S＜0.03%, surplus are Fe and unavoidable impurities.
Further, the thickness of described liner plate is greater than 140mm.
The weight of described liner plate is greater than 1500kg.
A kind of large-size ball mill castmethod of liner plate comprises melting technology process and heat treatment process:
(1) melting technology process
Adopt the basic electric arc furnace oxidation style, at first with alumine knotting smelting furnace furnace lining, at the bottom of smelting furnace, add end residue material afterwards, in smelting furnace, add carbon element steel scrap and molybdenum-iron then, when temperature reaches 1550～1600 ℃, add electrolytic manganese, ferrochrome, ferrosilicon, ferro-boron and ferro-niobium that drying is handled again, when temperature is 1620 ℃, in smelting furnace, add reductor and carry out deoxidation treatment, obtain the molten steel of tapping;
Before tapping molten steel tapping to ladle clean, baking processing, when being baked to ladle and being redness up and down, in ladle, place cerium-iron alloy again, afterwards described tapping molten steel is poured in the ladle and tapped, tapping temperature is controlled to be 1590～1610 ℃, slag mixes out, the tapping molten steel of pouring in the ladle reacts the processing of going bad with cerium-iron alloy in ladle, skim after calm 5～10 minutes more afterwards, when temperature is 1520～1540 ℃, molten steel in the ladle poured in the casting mold die cavity cast, obtain the liner plate foundry goods;
(2) heat treatment process
Described liner plate foundry goods is heat-treated, when rising to 300 ℃, puts into furnace temp the liner plate foundry goods, with 60 ℃/hour heat-up rates the liner plate foundry goods is heated to 650 ℃, be incubated 10 hours, be heated to 930 ℃ with stove again, be incubated 4 hours, subsequently the liner plate foundry goods is taken out from process furnace, put in the quenching oil medium of room temperature and quench, with stove the liner plate foundry goods is heated to 260 ℃ more afterwards, be incubated 4 hours and carry out temper, continuation is heated to 260 ℃ with stove, be incubated 2 hours and carry out temper,, obtain the liner plate finished product through cooling.The chemical constitution of liner plate finished product and the weight percentage of each moiety are: C:0.40～0.50%, Mn:1.8～2.0%, Si:0.7～1.0%, Cr:1.8～2.1%, Mo:0.35～0.65%, B:0.004～0.008%, Nb:0.03～0.04%, Ce:0.02～0.05%, P＜0.03%, S＜0.03%, surplus are Fe and unavoidable impurities.
Further, residue material of the described end is made up of lime and fluorite, and the weight ratio of lime and fluorite is: lime: fluorite=4:1.
The consumption of residue material of the described end is 2～3%.
The consumption of described cerium-iron alloy is 0.02～0.05%.
Described reductor is an aluminium.
The consumption of described reductor is 0.08%.
The present invention is by adding in medium carbon steel with silicon, manganese, chromium is main alloying element and a spot of molybdenum, boron, niobium, the cerium alloy element, medium carbon steel is carried out complex intensifying to be handled, the tissue and the hardening capacity of medium carbon steel have been improved, adopt rational castmethod simultaneously, give full play to silicon by melting technology process and heat treatment process, manganese, chromium, molybdenum, boron, niobium, the effect of cerium alloy element, the toughness and the wear resisting property of liner plate have been improved, reached the large-size ball mill required over-all properties of liner plate, the quality of the liner plate finished product that makes is good, work-ing life significant prolongation.Large-size ball mill of the present invention is main alloy element with the alloying element that adds in the liner plate with silicon, the manganese of cheapness, the addition control of chromium is no more than 2.1%, the addition of all the other alloying elements is a small amount of or micro-, therefore production cost is low, and castmethod is simple, and the price and the high mangaenese steel of the liner plate finished product that makes are suitable.The present invention has remarkable economic efficiency and social benefit.
Large-size ball mill provided by the invention uses the net thickness of liner plate greater than 140mm, and substance reaches more than the 1500kg.The wear resisting property excellence of liner plate finished product, hardness height, good toughness, intensity height, its hardness 〉=HBW515, impact toughness 〉=42J/cm
2, tensile strength can reach 1610MPa.
Embodiment
Embodiment 1
A kind of large-size ball mill liner plate, the weight percentage of its chemical constitution and each moiety is: C:0.40%, Mn:2.0%, Si:1.0%, Cr:1.8%, Mo:0.65%, B:0.008%, Nb:0.03%, Ce:0.05%, P:0.025%, S:0.021%, surplus is Fe and unavoidable impurities.
The thickness of this liner plate is 142mm, and single amount is 1556kg.
This large-size ball mill castmethod of liner plate comprises melting technology process and heat treatment process:
(1) melting technology process
Adopt the basic electric arc furnace oxidation style, at first with alumine knotting smelting furnace furnace lining, at the bottom of smelting furnace, add the end residue material of forming by lime and fluorite afterwards, wherein the weight ratio of lime and fluorite is: lime: fluorite=4:1, the consumption of end residue material is 3%, in smelting furnace, add carbon element steel scrap and molybdenum-iron then, when temperature reaches 1550 ℃, add electrolytic manganese, ferrochrome, ferrosilicon, ferro-boron and ferro-niobium that drying is handled again, when temperature is 1620 ℃, add aluminium and carry out deoxidation treatment in smelting furnace, the consumption of aluminium is 0.08%, obtains the molten steel of tapping;
Before the tapping of tapping molten steel, ladle is cleaned, baking processing, when being baked to ladle and being redness up and down, in ladle, place cerium-iron alloy again, the consumption of cerium-iron alloy is 0.05%, the molten steel of will tapping is afterwards poured in the ladle and is tapped, tapping temperature is controlled to be 1590～1610 ℃, slag mixes out, the tapping molten steel of pouring in the ladle reacts the processing of going bad with cerium-iron alloy in ladle, skim after calm 10 minutes more afterwards, when temperature is 1520～1540 ℃, the molten steel in the ladle poured in the casting mold die cavity cast, obtain the liner plate foundry goods;
(2) heat treatment process
The liner plate foundry goods is heat-treated, when rising to 300 ℃, puts into furnace temp the liner plate foundry goods, with 60 ℃/hour heat-up rates the liner plate foundry goods is heated to 650 ℃, be incubated 10 hours, reheat to 930 ℃, be incubated 4 hours, subsequently the liner plate foundry goods is taken out from process furnace, put in the quenching oil medium of room temperature and quench, again the liner plate foundry goods is heated to 260 ℃ afterwards, be incubated 4 hours and carry out temper, continue to be heated to 260 ℃, be incubated 2 hours and carry out temper,, obtain the liner plate finished product through cooling.
Embodiment 2
A kind of large-size ball mill liner plate, the weight percentage of its chemical constitution and each moiety is: C:0.50%, Mn:1.8%, Si:0.7%, Cr:2.1%, Mo:0.35%, B:0.004%, Nb:0.04%, Ce:0.02%, P:0.024%, S:0.027%, surplus is Fe and unavoidable impurities.
The thickness of this liner plate is 146mm, and single amount is 1593kg.
This large-size ball mill castmethod of liner plate comprises melting technology process and heat treatment process:
(1) melting technology process
Adopt the basic electric arc furnace oxidation style, at first with alumine knotting smelting furnace furnace lining, at the bottom of smelting furnace, add the end residue material of forming by lime and fluorite afterwards, wherein the weight ratio of lime and fluorite is: lime: fluorite=4:1, the consumption of end residue material is 2%, in smelting furnace, add carbon element steel scrap and molybdenum-iron then, when temperature reaches 1600 ℃, add electrolytic manganese, ferrochrome, ferrosilicon, ferro-boron and ferro-niobium that drying is handled again, when temperature is 1620 ℃, add aluminium and carry out deoxidation treatment in smelting furnace, the consumption of aluminium is 0.08%, obtains the molten steel of tapping;
Before the tapping of tapping molten steel, ladle is cleaned, baking processing, when being baked to ladle and being redness up and down, in ladle, place cerium-iron alloy again, the consumption of cerium-iron alloy is 0.02%, the molten steel of will tapping is afterwards poured in the ladle and is tapped, tapping temperature is controlled to be 1590～1610 ℃, slag mixes out, the tapping molten steel of pouring in the ladle reacts the processing of going bad with cerium-iron alloy in ladle, skim after calm 5 minutes more afterwards, when temperature is 1520～1540 ℃, the molten steel in the ladle poured in the casting mold die cavity cast, obtain the liner plate foundry goods;
(2) heat treatment process
The liner plate foundry goods is heat-treated, when rising to 300 ℃, puts into furnace temp the liner plate foundry goods, with 60 ℃/hour heat-up rates the liner plate foundry goods is heated to 650 ℃, be incubated 10 hours, reheat to 930 ℃, be incubated 4 hours, subsequently the liner plate foundry goods is taken out from process furnace, put in the quenching oil medium of room temperature and quench, again the liner plate foundry goods is heated to 260 ℃ afterwards, be incubated 4 hours and carry out temper, continue to be heated to 260 ℃, be incubated 2 hours and carry out temper,, obtain the liner plate finished product through cooling.
Embodiment 3
A kind of large-size ball mill liner plate, the weight percentage of its chemical constitution and each moiety is: C:0.40%, Mn:1.9%, Si:0.9%, Cr:1.9%, Mo:0.45%, B:0.006%, Nb:0.03%, Ce:0.02%, P:0.022%, S:0.021%, surplus is Fe and unavoidable impurities.
The thickness of this liner plate is 144mm, and single amount is 1582kg.
This large-size ball mill castmethod of liner plate comprises melting technology process and heat treatment process:
(1) melting technology process
Adopt the basic electric arc furnace oxidation style, at first with alumine knotting smelting furnace furnace lining, at the bottom of smelting furnace, add the end residue material of forming by lime and fluorite afterwards, wherein the weight ratio of lime and fluorite is: lime: fluorite=4:1, the consumption of end residue material is 2%, in smelting furnace, add carbon element steel scrap and molybdenum-iron then, when temperature reaches 1580 ℃, add electrolytic manganese, ferrochrome, ferrosilicon, ferro-boron and ferro-niobium that drying is handled again, when temperature is 1620 ℃, add aluminium and carry out deoxidation treatment in smelting furnace, the consumption of aluminium is 0.08%, obtains the molten steel of tapping;
Before the tapping of tapping molten steel, ladle is cleaned, baking processing, when being baked to ladle and being redness up and down, in ladle, place cerium-iron alloy again, the consumption of cerium-iron alloy is 0.02%, the molten steel of will tapping is afterwards poured in the ladle and is tapped, tapping temperature is controlled to be 1590～1610 ℃, slag mixes out, the tapping molten steel of pouring in the ladle reacts the processing of going bad with cerium-iron alloy in ladle, skim after calm 5 minutes more afterwards, when temperature is 1520～1540 ℃, the molten steel in the ladle poured in the casting mold die cavity cast, obtain the liner plate foundry goods;
(2) heat treatment process
The liner plate foundry goods is heat-treated, when rising to 300 ℃, puts into furnace temp the liner plate foundry goods, with 60 ℃/hour heat-up rates the liner plate foundry goods is heated to 650 ℃, be incubated 10 hours, reheat to 930 ℃, be incubated 4 hours, subsequently the liner plate foundry goods is taken out from process furnace, put in the quenching oil medium of room temperature and quench, again the liner plate foundry goods is heated to 260 ℃ afterwards, be incubated 4 hours and carry out temper, continue to be heated to 260 ℃, be incubated 2 hours and carry out temper,, obtain the liner plate finished product through cooling.
The liner plate end properties test data that embodiment 1, embodiment 2, embodiment 3 make is shown in Table 1.
Each embodiment liner plate end properties test data of table 1
Claims (10)
1. large-size ball mill liner plate, it is characterized in that: the chemical constitution of described liner plate and the weight percentage of each moiety are: C:0.40～0.50%, Mn:1.8～2.0%, Si:0.7～1.0%, Cr:1.8～2.1%, Mo:0.35～0.65%, B:0.004～0.008%, Nb:0.03～0.04%, Ce:0.02～0.05%, P＜0.03%, S＜0.03%, surplus are Fe and unavoidable impurities.
2. large-size ball mill liner plate according to claim 1 is characterized in that: the thickness of described liner plate is greater than 140mm.
3. large-size ball mill liner plate according to claim 1 is characterized in that: the weight of described liner plate is greater than 1500kg.
4. the arbitrary described large-size ball mill of a claim 1～3 is characterized in that: comprise melting technology process and heat treatment process with the castmethod of liner plate:
(1) melting technology process
Adopt the basic electric arc furnace oxidation style, at first with alumine knotting smelting furnace furnace lining, at the bottom of smelting furnace, add end residue material afterwards, in smelting furnace, add carbon element steel scrap and molybdenum-iron then, when temperature reaches 1550～1600 ℃, add electrolytic manganese, ferrochrome, ferrosilicon, ferro-boron and ferro-niobium that drying is handled again, when temperature is 1610～1630 ℃, in smelting furnace, add reductor and carry out deoxidation treatment, obtain the molten steel of tapping;
Before tapping molten steel tapping to ladle clean, baking processing, when being baked to ladle and being redness up and down, in ladle, place cerium-iron alloy again, afterwards described tapping molten steel is poured in the ladle and tapped, tapping temperature is controlled to be 1590～1610 ℃, slag mixes out, the tapping molten steel of pouring in the ladle reacts the processing of going bad with cerium-iron alloy in ladle, skim after calm 5～10 minutes more afterwards, when temperature is 1520～1540 ℃, molten steel in the ladle poured in the casting mold die cavity cast, obtain the liner plate foundry goods;
(2) heat treatment process
Described liner plate foundry goods is heat-treated, when rising to 280～300 ℃, puts into furnace temp the liner plate foundry goods, with 50～60 ℃/hour heat-up rates the liner plate foundry goods is heated to 630～650 ℃, be incubated 8～10 hours, reheat to 920～940 ℃, be incubated 4 hours, subsequently the liner plate foundry goods is taken out from process furnace, put in the quenching oil medium of room temperature and quench, again the liner plate foundry goods is heated to 240～260 ℃ afterwards, be incubated 4 hours and carry out temper, continue to be heated to 240～260 ℃, be incubated 2 hours and carry out temper,, obtain the liner plate finished product through cooling.
5. the large-size ball mill according to claim 4 castmethod of liner plate, it is characterized in that: residue material of the described end is made up of lime and fluorite, and the weight ratio of lime and fluorite is: lime: fluorite=4:1.
6. according to the castmethod of claim 4 or 5 described large-size ball mills usefulness liner plates, it is characterized in that: the consumption of residue material of the described end is weight percentage 2～3%.
7. the large-size ball mill according to claim 4 castmethod of liner plate, it is characterized in that: the consumption of described cerium-iron alloy is weight percentage 0.02～0.05%.
8. the large-size ball mill according to claim 4 castmethod of liner plate, it is characterized in that: described reductor is an aluminium.
9. according to the castmethod of claim 4 or 8 described large-size ball mills usefulness liner plates, it is characterized in that: the consumption of described reductor is 0.08%.
10. the large-size ball mill according to claim 4 castmethod of liner plate, it is characterized in that: the chemical constitution of described liner plate finished product and the weight percentage of each moiety are: C:0.40～0.50%, Mn:1.8～2.0%, Si:0.7～1.0%, Cr:1.8～2.1%, Mo:0.35～0.65%, B:0.004～0.008%, Nb:0.03～0.04%, Ce:0.02～0.05%, P＜0.03%, S＜0.03%, surplus are Fe and unavoidable impurities.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103131958A (en) * | 2011-11-26 | 2013-06-05 | 江苏南山冶金机械制造有限公司 | Low alloy abrasion-resistant steel |
| CN104087868A (en) * | 2014-06-24 | 2014-10-08 | 宁国市正兴耐磨材料有限公司 | Grinding table liner plate of medium speed coal mill, and manufacturing method thereof |
| CN104096621A (en) * | 2014-07-31 | 2014-10-15 | 宁国市鑫煌矿冶配件制造有限公司 | Preparation technology for wear resistant grinding body with high hardness for ball grinder |
| CN104099524A (en) * | 2014-07-31 | 2014-10-15 | 宁国市鑫煌矿冶配件制造有限公司 | Liner plate of ball mill for crushing large material |
| CN105088084A (en) * | 2015-09-16 | 2015-11-25 | 鞍钢集团矿业公司 | Medium alloy ultrahigh-toughness lining plate for breaker and preparing method thereof |
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| CN106282797A (en) * | 2016-08-31 | 2017-01-04 | 宁国市华丰耐磨材料有限公司 | Carbon Si Mn high intensity austenite ball grinding machine lining board and preparation method thereof in one |
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Cited By (11)
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| CN103131958A (en) * | 2011-11-26 | 2013-06-05 | 江苏南山冶金机械制造有限公司 | Low alloy abrasion-resistant steel |
| CN104087868A (en) * | 2014-06-24 | 2014-10-08 | 宁国市正兴耐磨材料有限公司 | Grinding table liner plate of medium speed coal mill, and manufacturing method thereof |
| CN104096621A (en) * | 2014-07-31 | 2014-10-15 | 宁国市鑫煌矿冶配件制造有限公司 | Preparation technology for wear resistant grinding body with high hardness for ball grinder |
| CN104099524A (en) * | 2014-07-31 | 2014-10-15 | 宁国市鑫煌矿冶配件制造有限公司 | Liner plate of ball mill for crushing large material |
| CN105088084A (en) * | 2015-09-16 | 2015-11-25 | 鞍钢集团矿业公司 | Medium alloy ultrahigh-toughness lining plate for breaker and preparing method thereof |
| CN105088084B (en) * | 2015-09-16 | 2017-07-28 | 鞍钢集团矿业有限公司 | Alloy ultra-high strength and toughness liner plate and preparation method during a kind of disintegrating machine is used |
| CN106282797A (en) * | 2016-08-31 | 2017-01-04 | 宁国市华丰耐磨材料有限公司 | Carbon Si Mn high intensity austenite ball grinding machine lining board and preparation method thereof in one |
| CN106244928A (en) * | 2016-10-12 | 2016-12-21 | 繁昌县金科机电科技有限公司 | Utilize swage blasting craft casting screw connector and preparation method thereof |
| CN106399845A (en) * | 2016-10-12 | 2017-02-15 | 繁昌县金科机电科技有限公司 | Anti-fatigue high-corrosion-resistance nut connecting piece and preparation method thereof |
| CN106702272A (en) * | 2016-11-29 | 2017-05-24 | 河南科技大学 | Low-alloy cast steel liner plate and preparation method thereof |
| CN115679215A (en) * | 2022-11-08 | 2023-02-03 | 内蒙古中天宏远稀土新材料股份公司 | Grinding ball and manufacturing method thereof |
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